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Videos de Conceptos Relacionados

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
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The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Video Experimental Relacionado

Updated: Dec 14, 2025

Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production
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Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production

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La entrada de señales de las vías divergentes subvierte la transformación de la célula B

Lai N Chan1, Mark A Murakami2,3, Mark E Robinson1

  • 1Department of Systems Biology, City of Hope Comprehensive Cancer Center, Monrovia, CA, USA.

Nature
|July 24, 2020
PubMed
Resumen
Este resumen es generado por máquina.

El cáncer se desarrolla cuando las mutaciones convergen en una sola vía oncogénica, no individualmente. La reactivación de vías suprimidas puede revertir la transformación y mejorar el tratamiento de la leucemia.

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Área de la Ciencia:

  • En el campo de la oncología
  • Biología molecular
  • La genética

Sus antecedentes:

  • El cáncer surge de mutaciones genéticas acumuladas.
  • La leucemogénesis implica vías oncogénicas específicas que impulsan la transformación celular.
  • La leucemia linfoblástica aguda de células B (B-ALL) se caracteriza por lesiones genéticas distintas.

Objetivo del estudio:

  • Investigar el papel de las vías oncogénicas convergentes en la LLA-B.
  • Para entender cómo las vías divergentes afectan a la leucemogénesis.
  • Explorar estrategias terapéuticas dirigidas a las vías oncogénicas en la LLAB.

Principales métodos:

  • Análisis de 1.148 muestras de B-ALL derivadas de pacientes.
  • Mutación de una sola célula y análisis de fosfo-proteínas.
  • Investigar las vías de señalización STAT5 y ERK y sus factores de transcripción asociados (MYC, BCL6).

Principales resultados:

  • El desarrollo de la leucemia requiere convergencia en una única vía oncogénica característica de la etapa de diferenciación celular.
  • Las mutaciones que activan STAT5 (etapa pro-célula B) o ERK (etapa pre-célula B) son comunes, pero generalmente se segregan en clones competidores.
  • La reactivación de las vías divergentes suprimidas revirtió la transformación, mientras que su eliminación la aceleró.

Conclusiones:

  • La convergencia en un factor oncogénico principal es fundamental para el inicio de la leucemia.
  • Las vías de señalización divergentes actúan como una barrera para la transformación.
  • La reactivación de las vías divergentes suprimidas ofrece una nueva estrategia terapéutica para mejorar la respuesta al tratamiento en la B-ALL, sinergizando con la inhibición del principal factor oncogénico.